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(No Model.) 7 v E. L. BRYANT & E. E. TRUMPBOUR'.

, SUSPENSION DEVICE FOR LAMPS.

No. 390,887. Patented Oct. 9, 1888.

EINTTED STATES PATENT ()FFIcE.

EDSON L. BRYANT AND EGBERT E. TRUMPBOUR, OF ANSONIA, CONNECTICUT,

ASSIGNORS OF ONE-HALF TO WALLACE & SONS, OF SAME PLACE.

SUSPENSION DEVICE FOR LAMPS.

SPECIFICATION forming part of Letters Patent No. 390,837, dated October9, 1888.

Serial No. 268,528. (No model.)

To all whom it may concern.-

Be it known that we, EDsoN L. BRYANT and EGBERT E. TRUMPBOUR, ofAnsonia, in the county of New Haven and State of Connecticut,

haveinvented a new Improvement in Suspension Devices for Lamps, &c.; andwe do hereby declare the following, when taken in connection withaccompanying drawings and the letters of reference marked thereon, to bea full,

clear, and exact description of the same, and which said drawingsconstitute part of this specification, and represent, in-

Figure 1, a side View of the suspension device complete; Fig. 2, avertical central section at right angles to the axis; Fig. 3, a detachedview showing the drum as made integral with the spring; Fig. 4, adetached view showing the drum as made by an extension riveted orsecured to the outer end of the spring.

This invention relates to an improvement in that class ofsuspensiondevices for lamps and likepurposes which consists of a coiledspring arranged upon an axis supported in a frame, with a band or otherdevice connected thereto, so that as the said band carrying the thingsuspended is drawn downward the spring is wound, and then the reactionof the spring will raise or aid in raising the thing suspended andrewind the band or chain.

In the more general construction of this class of lifting devices a drumis hung upon an axis in the frame, within which a flat or ribbon springis coiled, one end being fixed to the axis, the axis fixed in the frame,the other end 5 of the spring fixed to the drum, and the band or chainis attached to the outer surface of the drum, so as to be wound thereonor drawn therefrom, as the case may be. The construction of a drum to besupported upon and so 0 as to revolve on the axis and contain the springis one of the principal elements of cost in the manufacture of suchsuspension-devices.

The object of our invention is to provide a drum which shall contain thespring and upon 5 which the band, or whateverit may be, may be Wound, asin the usual construction, but yet so simplify the construction of thedrum that it becomes an immaterial part of the cost of manufacture, andalso to produce an axle for the spring of cheap construction and towhich the inner end of the spring may be easily attached, and itconsists in an extension of the outer end of the spring to form a fullconvolution, the extreme outer end secured to said convolution, so as toform a cylinder surrounding the spring, as more fully hereinafterdescribed.

A represents the frame which carries the spring, and which isconstructed with a loop,

13, or other suitable device by which the frame may be suspended.Transversely across the frame is the axle O, prevented from rotation byan arm, D, extending from the axle against a projection, E, on theframe, or it may be held by any of the devices usually employed for 6this purpose.

F represents the spring, which is a flat ribbon of steel or othersuitable metal, and such as usually employed in lifting devices. Thisspring is coiled also in the usual manner. The outer end of the springis riveted to the first convolution of the spring, as seen in Fig. 3, sothat this outer convolution forms a cylinder or drum surrounding theother convolutions which are within the drum. The drum therefore becomesa part of the spring. The inner end of the spring is secured to theaxle, so as to remain stationary within the axle,while the drum is freeto revolve around the axle; but the drum has no positive axis, as in theusual construction, where the drum is provided with heads and madeseparate from the spring, but, on the contrary, the drum thus formed asa part of the spring is supported by the spring alone.

The connection with the lifting device, which is here represented as aband, G, is attached to the drum, and this is best done by introducingthe end of the band between the outer end of the spring and'the nextconvolution, as represented in Fig. 3, so that the one securing devicenot only forms the drum, but secures the band, chain, or whatever it maybe to the periphery of the drum. By this construction the drum iscomposed of an integral part of the spring, employing only the outerconvolution of the spring in so doing, and therefore its cost in themanufacture is only the securing of the 'outerend of the spring to theouter convolution.

While we prefer to employ the outer convolution of the spring to formthe drum,the drum may be formed of a separate piece bent intocylindrical shape, so as to bringits two ends to overlap, and then theouter end of the spring introduced between the two ends of thissurrounding cylinder and there secured; but it will be observed thatthis forms substantially the same drum as if the drum were made integralwith the spring. In either case there is an extension of the outer endof the spring for a full convolution and the outer end of the extensionis secured to the said outer convolution to form the surroundingcylinder or drum. Therefore, while it may be as an integral part of thespring.t11e dru n1 itself is not a part of the spring so far as theelasticity is concerned.

We clain1- In a suspension device substantially such as described, thecombination of the frame, a stationary axle with a spring coiled aboutthe said axle, the inner end secured to the axle. and a drum surroundingthe-spring, made by an extension from the outer end of the spring,forming a full convolution, the outer end of said extension secured tothe said convolution, so as to form a cylinder surrounding the springwithin it substantially as described.

EDSON L. BRYANT. EGBERT E. TRUMPBOUR. Witnesses:

W. N. Emacs, BURWELL A. BRADLEY.

